Agreed, however I have not seen any specifics on that, the headway changes had a direct effect on our software, reliability and maintenance aren't factors for u

Agreed, however I have not seen any specifics on that, the headway changes had a direct effect on our software, reliability and maintenance aren't factors for us. Rio Tinto are extremely safety conscious, for example they drug and alcohol test everyone, regardless of role even vendors. They're also operating in the Pilbara region an incredibly harsh desert environment in Western Australia. So I would guess that they wouldn't accept an increase in safety risks and the trade off between risk of break downs, maintenance cost and the throughput of their rail network is positive.